Hush, hush. I sin when I toothbrush.

Psssst. Wanna hear my secret eco-sin? I sometimes let the water run when brushing my teeth. (I also don't brush for the full two minutes, but that's more of a dental sin than an eco one.) I can't stand the feeling of a mouth full of froth without the sound of running water promising an imminent, satisfying rinse. I even get a little desperate in the dentist chair between rinsings.